/*
*基于state的getter计算属性对象
*/
export default{
    totalCount(state){
       return state.cartFoods.reduce((preTotal,food)=>preTotal+food.count,0)
    },
    totalPrice(state){
        return state.cartFoods.reduce((preTotal,food)=>preTotal+food.count*food.price,0)
     },
    positiveSize(state){
         return state.ratings.reduce((preTotal,rating)=>preTotal + (rating.rateType===0 ? 1:0) ,0)
     }
}